Ceramics-Silikáty

Isothermal calorimetry quantifies the heat flow of cementitious materials during hydration. The paper summarises the calorimetry results from 65 industrially produced cements manufactured between 2018-2025 in the central European region. The hydration proceeds under 20 °C, covering a wide range of Portland cements (CEM I), Portland slag-limestone cement (CEM II), blast furnace cement (CEM III), composite cements (CEM V), alkali-activated cement and sulfocalcic cement. The water/cement ratio was kept in a range of 0.40-0.50, the shortest measurement time took 237 h and the mean time was 421 h. Each cement is approximated with a four-parametric affinity hydration model with a standard deviation error as 4.11 J/g and 11 selected cements are approximated with a simpler exponential model. The comprehensive database can serve for the prediction of the microstructure, mechanical properties, or temperature rise in massive concrete structures.